Sony VGN-TX1HP/W User Manual page 79

To select the Multiple Monitors mode
1 Right-click on the desktop to display the context menu.
2 Point to Graphics Options and click Graphics Properties.
3 Select Extended Desktop from the Display Devices menu.
To change the primary and secondary device settings, use the Primary Device and Secondary Device drop-down lists
under Multiple Display.
4 Click OK.
If the Monitor Settings window appears, click OK.
Additionally, you can set the display colors and resolution for each display and customize the Multiple Monitors mode.
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Using Peripheral Devices